Shear-guide.



P. H. SUMNER.

SHEAR GUIDE.

APPLICATION FILED 111m, 1911.

1 005 0 2 Patented Oct. 3, 1911.

, INVENTOR 17% 1932427272 WITNESSES ATTORNEYS FRED H. SUMNER, OF SANFRANCISCO, CALIFORNIA.

SI-IEAR- GUIDE.

Specification of Letters Patent.

Patented Oct. 3, 1911.

Application filed January 5, 1911. Serial No. 600,911.

To all whom it may concern:

Be it known that I, FRED H. SUMNER, a citizen of the United States, anda resident of San Francisco, in the county of San Francisco and State ofCalifornia, have invented a new and Improved Shear-Guide, of which thefollowing is a full, clear, and exact description.

This invention relates to a shear guide and blade-sharpening device,particularly adapted for sharpening shears.

I have for an object, the-construction of a simple and improved device,whereby a blade is held in adjustment against a sharpening stone in sucha manner as to allow of a free swinging movement of the edge of theblade across the sharpening stone.

A further object of the invention is to provide means whereby theinclination of the blade on the sharpening stone may be varied at will,and held in its adjusted position.

A further object of the invention is to provide means whereby the stonewill always be kept in contact with the edge of the blade.

I attain these objects by pivotally mounting a cutting stone upon asupport and from the same support pivot a blade-carrying mechanismhaving adjustable arms admittingof movement in two directions, betweenwhich are inserted the blade.

With the above and other objects in view, as will more fully hereinafterappear, the present invention consists in certain novel details ofconstruction and arrangement of parts hereinafter fully described,illustrated in the accompanying drawings, and more particularly pointedout in the appended claims.

In the accompanying drawings, forming part of this specification, thereference characters of which indicate corresponding parts in theseveral figures,--Figure 1 is a perspective view of a preferred embodi-'ment of my invention; Fig. 2 is a transverse sectional view showing thestone and the position of the blade upon said stone; Fig. 3 is adetailed sectional view on the line 33 of Fig. 2, showing a blade havinga curved edge positioned on the cutting stone; and Fig. 4 is a detailedelevation showing a preferred embodiment of my blade-holding device.

Positioned upon the support A by means j of any suitable bracket B, is aplate C.

From the upper side of the plate C, projects a pair of spaced-apart lugs1, between which is pivoted, by any suitable means as threaded bolts 2,a frame 3 opened on its longitudinal side 5. Firmly mounted in thisframe 3, is a sharpening device 6, preferably carborundum stone. Bymeans of this construction, the plate is adapted to be pivoted on thebolts 2, so as to be always tangent to the curved surface 7 of the shearblade 8, which blade is moved across the stone 6 and in the same planetherewith. Pivoted upon a lug 9 projecting from one end of the plate C,is a swinging arm 10, the outer end of which is pivoted to an offset 11,extending at right angles to the supporting upright 12 of theblade-carrying device. This supporting upright 12 is bent at rightangles to itself, to form a flanged portion 13, and the side of thesupporting upright opposite the flange 13, is bent into aparallelly-disposed car 14. The flange 13 and the car 14 constitute abearing for a pin 15, which pin carries a vertically-disposed plate 26.

From the lower end of the supporting upright 12, is an arm 16, pivotedto the offset lug 17. The upper end of the arm 16 is bent into a flange18 to afford a hearing for the milled-head nut 19. Permanently aflixedto the supporting arm of the upright 12, and passing through apertures20 in the plate 26 and through apertures 21 in the flange 18, is athreaded screw 22. Positioned on the screw 22 and working in a recess 28in the flange 13, is a milledhead nut 24. This milled-head nut 2-1bearing against the plate 26, moves this plate in position at differentangles with reference to the upright 12. Surrounding the screw 22 andpositioned between the plate 26 and the inside of the flange member 18,is an extension spring 25, which spring will keep the arm 16 and theplate 26 separate. Between. the arm 16 and the plate 26, is positionedthe shear blade 8, which it is desired to sharpen.

In sharpening blades of this character, it is always desirable to havethe flat edge of the blade in contact at the same angle on the stonewithout any rocking movement, but, at the same time, to have all pointsof the edge come in contact with the stone at some portion of the swing.In order to accomplish this, the blade is inserted between the arm 16and the plate 26, and by adjusting the nut 24, the blade 8 is moved onits pivot until the fiat face of the edge rests squarely upon the stone;then by turning the nut 19, the arm 16 acts against the force of thespring 25 and firmly clamps the blade in position. By a swingingmovement, the blade swinging on the two pivots 27, 28, is drawn acrossthe face of the stone.

As the outer curved end 7 of the blade approaches the stone, the'latterwill rock on its pivotal adjustment, thereby always bring ing the edgeof the blade squarely against the stone.

As many changes could be made in the above construction and manyapparently widely diiferent embodiments of this invention could be madewithout departing from the scope thereof, it is intended that allmatters contained herein in the above description or shown in theaccompanying drawings shall be interpreted as illustrative and not in alimiting sense. It is also to be understood that the language used inthe following claims is merely intended to cover all the generic andspecific features of the invention herein described, and all statementsof the scope of the invention, which, as a matter of language, might besaid to fall therebetween, and that materials, sizes and relativities ofparts are non-essential, exceptas called for in the claims,

Having thus described my invention, I claim as new and desire to secureby Letters Patent:

1. In a blade-sharpening device, a supporting plate, an arm pivoted tosaid plate, a blade carrying member pivoted to said arm,.. means on saidmember whereby a swinging motion is given to the shears, and meanscoacting with said plate, whereby a curved edge of the'blade is keptsquarely to the surface of the plate.

2. In a shear guider, a shearcarrying member, comprising a pivotedupright, a side angularly disposed to said upright, an arm pivoted tosaid side, a fiangeon said arm, a threaded screw attached to saidupright and passing through said flange, and means on the end of saidscrew, whereby the shears may be clamped between said arm and upright.

- 3. In a shear guider, a shear-carrying member, comprising a pivotedupright, a side angularly disposed to said upright, an arm pivoted'tosaid side, a flange on said arm, a threaded screw attached to saidupright and passing through said flange, means on the end of said screw,whereby the shears may be clamped between said arm and up Cepies of thispatent may be obtained for right, and a coil spring between said uprightand arm adapted to separate the two. I. In a shear guider, an upright,an arm pivoted to said upright, a plate between said upright and arm,and means afiixed to said upright and passing through said plate andarm, adapted to clamp the shear between said plate and arm at differentangles.

5. In a shear-sharpening device, a pivoted stone, a shear-carryingdevice moving in the plane of said stone, and means coacting with thedevice, whereby the face of the stone is kept fiat on the edge of theshears.

6. In a shear-sharpening device, a movable sharpening stone and an arm,a bladecarrying device pivoted to said arm and moving in the plane ofsaid stone, whereby curved blade held in said device moves thesharpening stone to fit the edge of the blade.

7. In a shear guider, an upright, a lug projecting from said upright, anarm pivoted to said lug, a plate pivoted at one end of said upright,means whereby the shears to be sharpened are clamped between said armand plate, and means for regulating the position of said clamped shears.

8. In a shear guider, an upright, a lug projecting from said upright, anarm pivoted to said lug, a plate pivoted at one end of said upright,means adapted to clamp a blade of the shears between said arm and plate,means varying the angle of said clamped blade, and means locking saidand arm, said means comprising a threaded screw, a nut on said screw,and a spring holding the arm in adjusted position against the nut.

10. In a shear guider, an upright, an arm movable on said upright, aplate movable with relation to said upright, adapted to clamp a blade ofa shears in position, and means controlling the relative position of theplate and arm, said means comprising a threaded screw, and a nut on saidscrew between said upright and plate, whereby the angle of the plate isvaried.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

FRED H. SUMNER.

Witnesses:

GEORGE M. ALTIZER, R. S. CHAPMAN.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

